<!--
   
   Copyright (c) 2017, the Perspective Authors.
   
   This file is part of the Perspective library, distributed under the terms of
   the Apache License 2.0.  The full license can be found in the LICENSE file.

-->

<!DOCTYPE html>
<html>

<head>

    <meta 
        name="viewport"
        content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">

        <script src="perspective-viewer.js"></script>
        <script src="perspective-viewer-datagrid.js"></script>
        <script src="perspective-viewer-d3fc.js"></script>
    
        <script src="perspective.js"></script>
    
        <link rel='stylesheet' href="material.css" is="custom-style">
    
    <style>
    
        perspective-viewer {
            flex: 1;
            margin: 24px;
            overflow: visible;

            --plugin--box-shadow: 0px 4px 3px rgba(0, 0, 0, 0.1);
            --plugin--border: 1px solid #ddd;
        }

        #app {
            display: flex;
            flex-direction: column;
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #eee
        }

        #controls {
            display: flex;
            margin: 24px 24px 0px 40px;
        }

        .range {
            position: relative;
            display: inline-flex;
            flex-direction: column;
            margin-right: 24px;
        }

        span, input, button {
            font-family: "Open Sans";
            font-size: 12px;
            background: none;
            margin: 0px;
            border-color: #ccc;
            color: #666;
            padding: 6px 12px 6px 0px;
        }

        input {
            height: 14px;
            border-width: 0px;
            border-style: solid;
            border-bottom-width: 1px;
            color: inherit;
            outline: none;
        }

        input[type=range] {
            margin-top: 2px;
        }

        input[type=number] {
            font-family: "Roboto Mono";
        }

        input:focus {
            border-color: #1a7da1;
        }

        input::placeholder {
            color: #ccc;
        }
        
        button {
            border: 1px solid #ccc;
            text-transform: uppercase;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            padding-left: 12px;
            height: 28px;
            outline: none;
        }

        button:hover {
            cursor: pointer;
        }

        #run {
            justify-self: center;
            margin-right: 24px;
            height: 83px;
            width: 80px;
        }

    </style>
</head>

<body>

    <div id="app">
        <div id="controls">
            <button id="run">Run</button>
            <div class="range">
                <span>Rows</span>
                <input id="num_rows" min="25" max="1000000" type="number" placeholder="#" value="10000"></input>
                <input id="num_batches" min="1" max="100" type="number" placeholder="#" value="1"></input>
            </div>
            <div class="range">
                <span>Float columns</span>
                <input id="num_float" min="0" max="50" type="number" placeholder="#" value="5"></input>
            </div>
            <div class="range">
                <span>Integer columns</span>
                <input id="num_integer" min="0" max="50" type="number" placeholder="#" value="5"></input>
            </div>
            <div class="range">
                <span>String columns</span>
                <input id="num_string" min="0" max="50" type="number" placeholder="#" value="5"></input>
                <input id="num_strings" min="1" max="500" type="number" placeholder="Unique Strings" value="50"></input>
            </div>
            <div class="range">
                <span>Datetime columns</span>
                <input id="num_datetime" min="0" max="50" type="number" placeholder="#" value="5"></input>
            </div>
        </div>

        <perspective-viewer 
            id="viewer">

        </perspective-viewer>
    </div>

    <script>

        const WORKER = window.perspective.worker();

        const choose = x => x[Math.floor(Math.random() * x.length)];
        const range = (x, y) => Math.random() * (y - x) + x;
        const rand_string = () => Math.random().toString(36).substring(7);
        const strings = choices => new Array(choices).fill(null).map(rand_string);
        const colname = (name, x) => `${name.charAt(0).toUpperCase() + name.slice(1)} ${x}`;

        function* col_iter() {
            for (const name of ["float", "integer", "string", "datetime"]) {
                const ncols = window[`num_${name}`].value;
                for (let x = 0; x < ncols; x ++) {
                    yield [name, x];;
                }
            }
        }

        const assign = fn => {
            const obj = {};
            for (const [name, x] of col_iter()) {
                obj[colname(name, x)] = fn(name, x);
            }
            return obj;
        }

        const new_schema = () => assign(x => x);

        let STRINGS;
        function reset_strings_cache() {
            STRINGS = {};
        }

        reset_strings_cache();

        const get_dict = xs => {
            STRINGS[xs] = STRINGS[xs] || strings(parseInt(num_strings.value));
            return STRINGS[xs];
        }

        const CELL_ARGS = {
            "float": () => range(-10, 10),
            "integer": () => Math.floor(range(-10, 10)),
            "string" : xs => choose(get_dict(xs)),
            "datetime": () => new Date()
        };

        const new_row = () => assign((name, x) => CELL_ARGS[name](x));

        const gen_data = () => {
            reset_strings_cache();
            let nrows = num_rows.value;
            let rows = [];
            const batch_size = Math.floor(nrows / num_batches.value);
            const tbl = WORKER.table(new_schema());
            (function batch() {
                while (nrows > 0) {
                    rows.push(new_row());
                    nrows--;
                    if (nrows % batch_size === 0) {
                        tbl.update(rows);
                        rows = [];
                        setTimeout(batch, 100);
                        break;
                    }
                }
            })();
            return tbl;
        }

        // GUI

        const make_run_click_callback = (state) => async () => {
            const old_table = state.table;
            state.table = gen_data();
            window.viewer.load(state.table);
            if (old_table) {
                old_table.delete();
            }
        }

        // Main

        window.addEventListener("WebComponentsReady", async function() {
            run.addEventListener("click", make_run_click_callback({}));
            run.dispatchEvent(new Event("click"));
        });

    </script>

</body>

</html>